KV2 audio KV2’s 500 Series Unique Analog Thermo Audio Compressor User Guide

KV2 audio KV2’s 500 Series Unique Analog Thermo Audio Compressor

Product Information

The KV2’s 500 Series is a professional audio equipment that includes TCL, QD8, and MPA modules. The TCL module, with part number KVV 987 478, is a superior RMS audio thermo-compressor with a limiter. It is designed to provide high- quality audio compression and enhancement.

Application:
The TCL module can be used in various audio applications, such as live sound reinforcement, studio recording, broadcast, and more.

Controls:

1. LIMITER: Sets the maximum input level and provides hard limiting to prevent signal overload. The active state of the limiter is indicated by the limiter LED.
2. DRIVE: Controls the drive level for the input of the compressor’s gain reduction circuit.
3. LOW-MID Switch: Allows two alternate settings of the low pass filter frequency in the thermo-compressor LF enhancement circuit. This can be adjusted based on personal preference, microphone type, and individual voice characteristics.

Block Diagram:

Specifications:

• System Acoustic Performance: -3dB Response from 15Hz to 100kHz
• Total Harmonic Distortion: Low distortion for clean and accurate audio reproduction
• Signal Input: Supports multiple input channels with adjustable input impedance
• Max. Input Voltage: Allows for high input levels without distortion
• Signal Output: Provides clean and amplified output signals
• Max. Output Voltage: Delivers high output levels for various applications
• Output Impedance: Matches the impedance requirements of connected devices
• Features: Limiter, Drive, Bass enhancement, Low-Mid output adjustments, Bypass option
• Power Requirements: Works with standard operating voltages and consumes low power
• Physical Dimensions: Designed in API Series 500 format for easy integration into compatible chassis

Product Usage Instructions

Installation Safety Instructions:

1. Turn off the power to the 500 series chassis before installing the modules.
2. Unpack the module and ensure the rear connector is free of debris.
3. Align and slide the module into the 500 series chassis, ensuring the connectors on the back properly seat with the connectors in the chassis.
4. Install the included screws to secure the module to the chassis. Use the correct screw type for your chassis.
5. Power on the chassis and enjoy the audio capabilities of the modules.
6. WARNING: Do not hot swap 500 series modules. Always power down the chassis when installing or removing modules to avoid potential damage.

Note: Please refer to the complete user guide for detailed information on operating instructions, safety precautions, and additional features of the KV2’s 500 Series modules.

KV2’s 500 SERIES · Safety Instruction

Important Safety Instructions
Before using your TCL, QD8, MPA be sure to carefully read the applicable items of these operating instructions and the safety suggestions.

1. Read all product instructions.
2. Keep printed instructions, do not throw away.
3. Respect and review all warnings.
4. Follow all instructions.
5. Clean only with dry cloth.
6. Install in accordance with KV2 Audio’s recommended installation instructions.
7. Only use accessories specified by KV2 Audio.
8. An experienced user shall always supervise this professional audio equipment.

Installation Safety Instructions
To install the KV2’s 500 Series modules into a 500 series chassis:

1. Turn off the power to the 500 series chassis.
2. Unpack the module and ensure the rear connector is free of debris.
3. Align and slide the module into the 500 series chassis, ensuring the connectors on the back properly seat with the connectors in the chassis.
4. Install the included screws to secure the module to the chassis. Both metric and standard screws are included. Use the correct screw type for your chassis.
5. Power on the chassis.
6. Enjoy!

WARNING! Do not hot swap 500 series modules! Doing so can potentially cause damage to the 500 series module or chassis. Always power down the chassis when installing or removing 500 series modules.

TCL · Overview

TCL – 500 SERIES
Superior RMS – Audio Thermo-Compressor with Limiter

Introduction
The TCL is a unique analog thermo audio compressor featuring a superior natural RMS detector and dynamic voice bass enhancement control. In another KV2 first its patented design offers an exceptionally musical and natural compression that is a component part of its real-time input, rather than a typical side fed gain reduction circuit attempting to either follow or anticipate compression demands. Its additional Bass balance control circuit allows the user to smooth out and minimise any proximity effects from a changing microphone position, giving the perfect voice color to every performance, from beginning to end. Featuring source intelligent attack and release times, whatever the dynamic content, with just a few simple steps the results from the 500 Series TCL are truly exceptional.

Application

• The TCL is the ultimate compression tool for various studio and live applications with instruments and voice.
• The TCL perfectly suits Musical theatre – giving consistency, richness and depth to head worn microphones.
• The TCL is ideal for corporate  presentations – giving a full, warm, full voice timbre and allowing tone matching for lecturn and lavalier microphones.
• The TCL can be used live on many musical instruments, both classical and contemporary.

Controls

1. LIMITER
   Serves to set the maximum input level. Any subsequent levels above the set level are hard limited.
   This ensures that any connected devices further down the signal chain are not affected by an overloaded input The limiter’s active state is indicated by the limiter LED.

2. DRIVE
   This control sets the drive level for the input of the compressor’s gain reduction circuit.

3. LOW
   Serves as a low frequency enhancement circuit by rerouting some signal from the second in line thermo-compressor through a low pass filter, providing a full and warm bass enriched sound, even under compression.
   Select the required bass enhancement by sweeping the pot in a clockwise direction, where the center position presents a flat frequency response,
   with additional bass enhancement available beyond that point.
   The combined output of its signal path after gain reduction and the bass enhancement circuit blend, monitor and balance themselves perfectly
   in real-time to maintain the all important voice color within a 20dB range.

4. LOW-MID Switch
   This switch allows two alternate settings of the low pass filter frequency
   in the thermo-compressor LF enhancement circuit. This can be set to the operators preference depending on personal taste, microphone type and individual voice characteristics. (Male / female etc)

5. OUT
   Adjusts the output level.

6. METERS
   Output level meter – a 12 segment, 3 color peak reading meter serves to monitor the output signal level. If the red PEAK light flashes, the signal level is too high and should be reduced to prevent possible overload distortion.
   Gain reduction level meter – an 8 segment level meter displaying the amount of gain reduction performed by the compressor.

7. BYPASS
   Serves as a TCL module bypass.
   Please Note – In bypass mode all meters and LED indicators will still show the latest operation mode, but the audio path is unaffected by any of the settings.

TCL · Block diagram

TCL · Specifications

System Acoustic Perfomance

• -3dB Response 15Hz to 100kHz
• Total Harmonic Distortion <0.002%

Signal Input

• Input Channels 1
• Input Impedance 20kΩ
• Max. Input voltage +26dBu
• Features Limiter, Compressor, Bass enhancer

Signal Output

• Signal Output Channels 1
• Max. Output Voltage 18dBu (600Ω) RMS
• Output Impedance 600Ω

Features

• Limiter Adjustable
• Drive Adjustable
• Bass enhancement Adjustable
• Low-Mid Selects the bass enhancement LPF frequency
• Output Adjustable
• Indicators 12 segment VU meter, 8 segment gain reduction
• Bypass Yes

Power Requirements

• Power Consumption 120mA
• Operating Voltage ±16V

Physical Dimensions

• API Series 500 format One slot

QD8 · Overview

QD8 – 500 SERIES
Stereo 8-band Master Equaliser with Line Driver

Introduction
A revolutionary George Krampera 8-band Equaliser specifically designed to highlight a desired band without adversely affecting the overall sonic landscape. Whilst not intended for tuning out room modes, the frequency bands and filter types have been precisely chosen after extensive research, to perfectly align with the science of human hearing and our perception of achieving the ultimate spectral balance. In a Live scenario, faced with a number of different sources, program types, or performance genres at a festival or concert, the equalizer is very musical, intuitive and an exceptionally quick way to shape any mixed content to the sound you want to hear. In the studio, it can be either the simple enhancement of an instrument / vocal track, or the final mastering polish 2  to take an ordinary mix 1 and make it something very special.

NOTE
As the QD8 is a stereo (two channel unit) it will require a series 500 Rack that facilitates dual channel input and outputs. It is also recommended to insert the QD8 as the last unit
in the series 500 chain, directly before the amplifiers/speakers.

Application

• For use in Recording Studios as a master equalizer, single instrument, or group equalizer.
• Front of House PA system master equalizer, the unit is also equipped with line drivers designed to maintain audio signal integrity over long cable lengths (up to 200 m).
• Single stereo zone or dual mono system equalizer, to sonically match different fill speakers and zones with the main FOH PA when used in multiples.
• To reduce the harshness in some digital recordings, particularly around the 6kHz region.

Controls

1. 8-Band Equaliser
   The Equalizer boosts or cuts frequencies at 40, 80, 120, 250, 500, 3000, 6000 and 15000 Hz by +/-15dB.

2. Output level meter
   A 12 segment, 3 color peak reading meter serves to monitor the output signal level. The signal should average around ‘0dB’. If the red PEAK light flashes, the signal level is too high and should be reduced to prevent possible overload distortion. Controls

3. EQ ON switch
   8-band Equaliser EQ enable switch. When depressed, the EQ is bypassed.
   NOTE It is recommended to insert the QD8 as the last unit in the series 500 chain, directly before the amplifiers/speakers.

QD8 · Block diagram

QD8 · Specifications

System Acoustic Perfomance

• -3dB Response 10Hz to 100kHz
• Total Harmonic Distortion <0.001%

Signal Input

• Input Channels 2x
• Input Impedance 20 kΩ
• Max. Input voltage +26dBu

Signal Output

• Signal Output Channels 2x
• Max. Output Voltage 18dBu (600Ω) RMS
• Max. Output Current 300mA
• Output Impedance 50Ω

Features

• Equalization 8-band EQ
• Output Line driver

Power Requirements

• Power Consumption 160mA
• Operating Voltage ±16V

Physical Dimensions

• API Series 500 format One slot (dual channel series 500 rack required)

MPA · Overview

MPA – 500 SERIES
Microphone preamplifier

Introduction
The MPA is a Very High Definition microphone and musical instrument preamplifier with Class-A circuitry and a high quality transformer balanced output. A stepped Input gain selector is provided for easy and precise repeatability of settings.
The preamplifier features adjustable high and low pass filters, with an adjustable limiter to control clip level and a transformer isolated high impedance line input. It also has a further auxiliary transformer balanced isolated output meaning a number of these units can be used together to make a multi-channel stage preamp, for splitting FOH
and monitoring outputs, or for broadcast and recording duties -delivering them all through line drivers in pristine audio quality. Phase reverse and an in- built headphone amplifier, which doubles up as a third output, completes the feature rich unit. With the exceptional quality of all KV2’s analog outboard electronics, the MPA can replace a preamplifier, Di-box/Splitter, line driver and headphone amplifier all in one box.

Application

• A Very High Definition studio recording preamplifier with low noise and increased dynamic range.
• A stage preamplifier and splitter with Line driver capability and Class-A circuitry.
• An esoteric Musical Instrument preamplifier with filters, Hi-Z input and Class-A circuitry.

Controls

1. GAIN
   Adjusts the MPA’s input gain from +5dB to +60dB with 5dB steps. In conjunction with the 200 Ω setting a total gain of 74dB is available.

2. 48V
   Supplies +48 V to pins 2 and 3 of the main input XLR for microphones, or devices which require phantom power.

3. 20dB
   Applies the -20dB PAD for the main XLR input.

4. 200 Ω
   Switches the input transformer to accept a 200 Ω load impedance. The input sensitivity increases by +9dB. This serves as an input for equipment requiring
   a 200 Ω loading and also as a galvanic isolator, for dynamic microphones, ribbon microphones or line level outputs. This setting helps to increase the signal to noise ratio of low level output sources (e.g. ribbon microphones).

5. Line In / Hi-Z In
   This switch selects between the Main Mic input (XLR) and AUX input (XLR or front panel Jack). The AUX input sensitivity is reduced by -15dB. The front panel Jack input sensitivity is reduced by -10dB.

6. Applies output signal phase reverse. Both main XLR output and AUX output are reversed at the same time.

7. 16) VU
   Selects the signal meter display between input and output levels. The ‘IN’ and ‘OUT’ LEDs as shown at 16) indicate the current state of metering.

8. Hi-Z In / Phones
   Selects the front panel Jack function between the high impedance input and phones output.

9. Front panel Jack 6,3mm
   Serves as a high impedance input or Phones output.

10. HPF, FIX/TUNE (in conjunction with control 11)
    The controls 10) and 11) are designed to be operated together as an overall HPF/LPF circuit. To realise any settings from control no 10) you must first turn
    on the overall HPF/LPF section using control no 11). Turning this control from
    the off click position fully clockwise to the 50kHz setting will give you an open, extended high frequency setting without an audible filter. This gives an option
    to use just the HPF feature on its own by adjusting control no 10) leaving no

11. fully clockwise.
    The first position on the control 10) is fully anti clockwise. This is not the off position but in fact a special ‘FIXED VOCAL PRESET’ designed by George Krampera.
    This preset has been optimised to maintain a rich and full vocal quality, retaining and shaping the most important bass frequencies, whilst reducing any problematic low frequency content or typical rumble.
    The next part of the control is a tuneable high pass filter (HPF) selected by turning the control clockwise past the click. Select the required cut off frequency by sweeping from 10Hz to the maximum 500 Hz (when fully clockwise) The filters are adaptive, which means they change their characteristics depending on what frequency is selected. The lower the frequency that is applied, the steeper the filter is tuned.

11. LPF
    A tuneable low pass filter (LPF). This can be applied to clean up sounds from any unwanted high-frequency content. Once switched on, select the required cut off frequency by sweeping anticlockwise from the maximum 50 kHz down to 500 Hz. The LPF drops by 12dB per octave above the cut off frequency.
    NOTE-To use this LPF in isolation without any additional HPF adjustments set the control above no 10) to the minimum tuneable setting of 10Hz (Not the fully anti clockwise ‘Fixed vocal preset’ position).

12. CLIP
    The Clip limiter control sets the maximum output level, with all levels above this point limited. After switching on the clip circuit with a clockwise turn, the red LED to the right will indicate when the circuit is actively limiting. This ensures any further devices in the signal chain are not affected by undesired clipping or distortion.

13. OUT
    Adjusts the output level from -∞ to +5dB.

14. AUX-Phones
    Adjusts the AUX and Phones output levels.

15. Input /Output level meter
    A 12 segment, 3 color peak reading meter serves to monitor input or output signal levels depending on the position of the VU switch no 7). The signal should average around ‘0dB’. If the red PEAK light flashes, the signal level is too high and should be reduced using the GAIN control to prevent possible overload distortion.

MPA · Block diagram

MPA · Specifications

System Acoustic Perfomance

• -3dB Response 10Hz to 100kHz
• Total Harmonic Distortion <0.002%

Signal Input

• Input Channels 3x
• Input Impedance 2kΩ / 200Ω Mic (+9dB), 1MΩ Hi-Z In
• Max. Input voltage +26dBu
• Mic input Phantom power, -20dB, Gain, Phase, LPF, HPF
• Line input Hi-Z, Input transformer

Signal Output

• Signal Output Channels 3 (Main, Aux, Phones)
• Max. Output Voltage 19dBu (50Ω) RMS
• Recommended loading ≥50Ω balanced, ≥600Ω AUX unbal.,
• ≥10Ω phones

Features

• Input Level Control +5 to +60dB, 5dB step, total gain 74dB
• High Pass Filter Vocal preset / 10Hz to 500Hz
• Low Pass Filter 500Hz to 50kHz
• Clip Adjustable
• Indicators LED, 12 segment VU meter
• Phantom power 48V

Power Requirements

• Power Consumption 250mA
• Operating Voltage ±16V

Physical Dimensions

• API Series 500 format One slot

KV2’s 500 SERIES · Warranty · Service

Warranty
Your 500 SERIES is covered against defects in material and workmanship.
Refer to your supplier for more details.

Service
In the unlikely event that your 500 SERIES develops a problem, it must be returned to an authorised distributor, service centre or shipped directly to our factory. Because of the complexity of the design and the risk of electrical shock, all repairs must be attempted only by qualified technical personnel.
If the unit needs to be shipped back to the factory, it must be sent in its original carton. If improperly packed, the unit may be damaged.
To obtain service, contact your nearest KV2 Audio Service Centre, Distributor or Dealer.

The Future of Sound.
Made Perfectly Clear.
KV2 Audio International
Nádražní 936, 399 01 Milevsko
Czech Republic
Tel.: +420 383 809 320
Email: info@kv2audio.com
www.kv2audio.com
KVV120155-00-02-0

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